K. Zhou, S. Yang, и H. Zha. Proceedings of the 34th international ACM SIGIR conference on Research and development in Information Retrieval, стр. 315--324. New York, NY, USA, ACM, (2011)
C. Ziegler, S. McNee, J. Konstan, и G. Lausen. Proceedings of the 14th international conference on World Wide Web, стр. 22--32. New York, NY, USA, ACM Press, (2005)
C. Ziegler, L. Schmidt-Thieme, и G. Lausen. Proceedings of the 2nd ACM SIGIR Semantic Web and Information Retrieval Workshop, Sheffield, UK, (июля 2004)